00577naa#a2200181#i#450# EN\\bibl\113105 20260316113112.1 2311-1402 20110925b2011####ek#y0engy0150####ca RUS RU Mathematical modeling of heat transfer in solar collectors including thermal relaxation time Journal article Nizhnevartovsk Nizhnevartovsk State University 2011 4 с. Journal article local Galimov Iljas Amirovich Urazaeva Lilija Jusupovna nvsu.editorum.ru